1. manholes (minimum nominal bore 600 mm) for vessels of 1.0 meter diameter and above2. handholes (minimum size 200 mm) for vessels below 1.0 meter diameter.All nozzles shall be provided with flanges and shall be so arranged that practical pipe connections are possible. The stub length for all stub pipes shall be at least 200 mm, measured from the tank wall to the flange sealing surface. In the case of insulated vessels, the length shall be chosen so that there will be a clear space of at least 100 mm between the cover of the insulation and the underside of the flange. Nozzles below DN 25 are not acceptable.For insulated vessels, provisions must be made for fixing and supporting the insulation.All tank internals must be replaceable through the manhole unless by approval of the Owner. Prefabricated vessels must as a minimum have a coat of primer applied before transport. They shall be cleaned and internally dry. All openings must be secured closed before transport.Tank and vessel capacities given for process relevant documents and for basic design calculations shall be usable net volumes and shall be in the relevant documents clearly referred as such.